Dual Ground Segmentation for Foldable Wireless Antenna Stability
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Solution Overview
Problem
Flexible mobile communication devices experience performance deterioration in antenna transmission and reception due to shape changes, such as bending or folding, resulting in frequency shifts and reduced bandwidth.
Innovation Solution
A wireless communication device with a dual ground system where the first and second ground portions are electrically separated, allowing the device to be bent around their boundary, preventing ground current from reaching the antenna and minimizing additional resonance modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible phone is bent or folded to enable shape change and portability, then the device can be worn or folded in various shapes, but the antenna performance deteriorates due to coupling between the antenna and ground
Solution Approach 1:
The ground is divided into multiple ground portions (first ground portion, second ground portion, third ground portion) that are electrically separated from each other. This segmentation prevents the formation of a continuous ground path that would create coupling between the antenna and ground when the device is bent, thereby resolving the contradiction between shape adaptability and antenna performance reliability.
2Volume of moving object
If the antenna is positioned close to the ground in a bent state, then the device structure is compact, but additional resonance occurs and operating frequency shifts
Solution Approach 1:
The ground is segmented into multiple electrically isolated portions, which prevents the formation of a continuous ground path that would create coupling between the antenna and ground when the device is bent, thereby resolving the contradiction between shape adaptability and antenna performance reliability.
Solution Approach 2:
Different ground portions are positioned at different locations relative to the antenna, with each ground portion having a specific spatial relationship designed to minimize coupling. The first ground portion is positioned to avoid direct coupling with the antenna even when bent, maintaining local electromagnetic field quality and preventing frequency shifts.
3Reliability
If a single continuous ground is used, then the ground provides a complete reference potential, but bending the device creates coupling that forms feedback loops and additional modes
Solution Approach 1:
The ground is divided into multiple ground portions (first ground portion, second ground portion, third ground portion) that are electrically separated from each other. This segmentation prevents the formation of a continuous ground path that would create coupling between the antenna and ground when the device is bent, thereby resolving the contradiction between shape adaptability and antenna performance reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Maintains consistent antenna performance across shape changes, with minimal frequency deviation and bandwidth reduction, even when the device is bent, by isolating the ground current from the antenna.
Implementation Method 1
a first ground portion to which the antenna is grounded; and a second ground portion that is electrically separated from the first ground portion
Data Source
AI summary
A wireless communication device having a stable capacity of an antenna even if a terminal is bent or folded is disclosed. The wireless communication device includes an antenna, a first ground portion to which the antenna is grounded, and a second ground portion that is electrically separated from the first ground portion, and the wireless communication device is bent around a boundary between the first ground portion and the second ground portion.